Effect of Pyrolysis Temperature on Copper Aqueous Removal Capability of Biochar Derived from the Kelp Macrocystis pyrifera

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dc.contributor.authorAraya, Matias
dc.contributor.authorRivas, Jorge
dc.contributor.authorSepulveda, Graciela
dc.contributor.authorEspinoza Gonzalez, Camila
dc.contributor.authorLira, Sebastian
dc.contributor.authorMeynard, Andres
dc.contributor.authorBlanco, Elodie
dc.contributor.authorEscalona, Nestor
dc.contributor.authorGinocchio, Rosanna
dc.contributor.authorGarrido Ramirez, Elizabeth
dc.contributor.authorContreras Porcia, Loretto
dc.date.accessioned2024-01-10T13:44:51Z
dc.date.available2024-01-10T13:44:51Z
dc.date.issued2021
dc.description.abstractSeaweed biochar is an efficient alternative bioadsorbent for Cu2+ removal due to its low cost and heavy metal removal capacity. Using the slow pyrolysis process, we produced biochars from Macrocystis pyrifera at 300 (BC300), 450 (BC450), and 600 & DEG;C (BC600). The physicochemical and structural properties of the biochar samples improved with increasing pyrolysis temperature from 300 to 450 & DEG;C, whereas no significant differences were observed with further increases in temperature to 600 & DEG;C. The yield ranged between 49% and 62% and had a high ash content (57.5-71.1%). BC450 and BC600 presented the highest surface areas and higher porosities. The FTIR spectra indicated that an increase of temperature decreased the acidic functional groups due to depolymerization and the dehydration processes, increasing the aromatic structures and the presence of calcium carbonate. The fittings of the kinetic models were different for the BCs: for the BC450 and BC600 samples, the Cu2+ adsorption was well-represented by a pseudo-first-order model; for BC300, a better fit was obtained with the pseudo-second-order model. The rate-limiting step of Cu2+ adsorption on BCs was represented by both models, liquid film diffusion and intraparticle diffusion, with surface diffusion being more important in BC300 and BC600, and intraparticle diffusion in BC450, in agreement with the pore size of the biochar samples. The adsorption isotherms of all BCs showed Langmuir behavior, representative of a chemisorption process, which was corroborated by the energy adsorption values determined by the D-R model. The maximum monolayer Cu2+ adsorption capacities were 93.55 and 58.0 mg g(-1) for BC600 and BC450, respectively, whereas BC450 presented the highest affinity. Other mechanisms involved in controlling heavy metal removal from aqueous suspensions using these seaweed biochars remain to be explored. We conclude that BC450 and BC600 from M. pyrifera are the most efficient adsorbents for Cu2+ aqueous removal and are thus an appropriate alternative for bioremediation.</p>
dc.description.funderANID PIA/BASAL
dc.description.funderANID FONDECYT
dc.description.funderANID Millennium Science Initiative Program
dc.fechaingreso.objetodigital2024-05-23
dc.format.extent17 páginas
dc.fuente.origenWOS
dc.identifier.doi10.3390/app11199223
dc.identifier.eissn2076-3417
dc.identifier.urihttps://doi.org/10.3390/app11199223
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/78946
dc.identifier.wosidWOS:000707462000001
dc.information.autorucFacultad de Agronomía e Ingenieria Forestal; Ginocchio Cea, Rosanna; 0000-0003-4089-8188; 61759
dc.issue.numero19
dc.language.isoen
dc.nota.accesoContenido completo
dc.publisherMDPI
dc.revistaAPPLIED SCIENCES-BASEL
dc.rightsacceso abierto
dc.subjectLangmuir isotherm
dc.subjectadsorption
dc.subjectseaweeds
dc.subjectMacrocystis pyrifera
dc.subjectpyrolysis
dc.subjectcopper
dc.subjectCADMIUM BIOSORPTION
dc.subjectFEEDSTOCK TYPE
dc.subjectMACROALGAE
dc.subjectADSORPTION
dc.subjectKINETICS
dc.subjectSORPTION
dc.subjectMANURE
dc.subjectZINC
dc.subjectWASTE
dc.subjectALGAE
dc.subject.ods11 Sustainable Cities and Communities
dc.subject.ods06 Clean Water and Sanitation
dc.subject.odspa11 Ciudades y comunidades sostenibles
dc.subject.odspa06 Agua limpia y saneamiento
dc.titleEffect of Pyrolysis Temperature on Copper Aqueous Removal Capability of Biochar Derived from the Kelp Macrocystis pyrifera
dc.typeartículo
dc.volumen11
sipa.codpersvinculados61759
sipa.indexWOS
sipa.trazabilidadCarga SIPA;09-01-2024
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